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  Systems and methods for remanufacturing imaging componentsRelated Patent Categories: Electrophotography, Having Particular Structure, RemanufacturingThe Patent Description & Claims data below is from USPTO Patent Application 20070025759. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] The present invention generally relates to manufacturing, remanufacturing or repairing replaceable imaging components, and more particularly to apparatus and techniques for removing a drum or roller, such as an organic photo conductor (OPC) drum, for example, of a replaceable imaging cartridge adapted for holding marking material. [0002] In the imaging industry, there is a growing market for the remanufacture and refurbishing of various types of replaceable imaging cartridges such as toner cartridges, drum cartridges, inkjet cartridges, and the like. These imaging cartridges are used in imaging devices such as laser printers, xerographic copiers, inkjet printers, facsimile machines and the like, for example. Imaging cartridges, once spent, are unusable for their originally intended purpose. Without a refurbishing process these cartridges would simply be discarded, even though the cartridge itself may still have potential life. As a result, techniques have been developed specifically to address this issue. These processes may entail, for example, the disassembly of the various structures of the cartridge, replacing toner or ink, cleaning, adjusting or replacing any worn components and reassembling the imaging cartridge. [0003] Laser printer toner cartridges are typically composed of two portions. One of these sections is the waste bin assembly which houses the OPC drum. During the remanufacturing of a laser printer toner cartridge, the OPC drum may need to be replaced due to the wear or damage of the OPC drum. Typically, the OPC drum is held in place by opposing removable plates. These removable plates are typically attached to the waste bin by screws which allow a remanufacturer to easily remove at least one of the removable plates, replace the OPC drum, and reattach the removable plate. Such a technique allows for OPC drum replacement without causing damage to the toner cartridge. [0004] In the case of certain toner cartridges, such as the Hewlett-Packard Color LaserJet 2600, removable plates are not utilized to secure the OPC drum in place. Rather, the OPC drum is held in place by opposing end caps which are not readily removable. [0005] These end caps are secured to the waste bin in a substantially permanent fashion using, among other techniques, an adhesive, which prevents any easy disassembly. Moreover, forcing the removal of the end caps causes damage to the end cap and/or the waste bin. [0006] This damage results in print defects when the cartridge is reassembled due to the replacement OPC drum not being securely fastened to the waste bin housing as well as changes in the centerline of the OPC drum in relation to other cartridge components which leads to out of round rotation. Therefore, it would be advantageous to provide systems and methods removing an OPC drum in a toner cartridge having end caps which are fixedly secured to the waste bin or other portion of the toner cartridge without removing the fixed end caps. SUMMARY [0007] In one aspect of the present invention a method of removing an organic photo conductor (OPC) drum from a toner cartridge comprises providing a waste bin assembly comprising an OPC drum held between first and second OPC retaining members secured to the waste bin assembly. The OPC drum includes first and second hubs extending from ends of the OPC drum into the first and second OPC retaining members. The OPC drum is removed from the waste bin assembly without detaching the first and second OPC retaining members from the waste bin assembly. [0008] A more complete understanding of the present invention, as well as further features and advantages of the invention, will be apparent from the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0009] FIG. 1 shows a perspective view of the drive side end of an HP 2600 toner cartridge; [0010] FIG. 2 shows a perspective view of the non-drive side end view of an HP 2600 toner cartridge; [0011] FIG. 3 shows a cross-sectional view of the OPC drum and end caps of an HP 2600 toner cartridge; [0012] FIGS. 3A and 3B show perspective views of a waste bin assembly; [0013] FIG. 4 shows a cross-sectional view of the OPC drum and end caps of an HP 2600 toner cartridge with exemplary cutting locations in accordance with the present invention; [0014] FIG. 5 shows a cross-sectional view of an OPC drum being cut in accordance with the present invention; [0015] FIG. 6 shows a cross-sectional view of an OPC drum and end cap in accordance with the present invention; and [0016] FIG. 7 shows a cross-sectional view of an OPC drum and end cap in accordance with another aspect of the present invention. DETAILED DESCRIPTION [0017] The following detailed description of preferred embodiments refers to the accompanying drawings which illustrate specific embodiments of the invention. In the discussion that follows, specific systems and techniques for repairing, manufacturing or remanufacturing a toner cartridge, such as an HP 2600 toner cartridge, are disclosed. Other embodiments having different structures and operations for the repair, remanufacture and operation of other types of replaceable imaging components and for various types of imaging devices, such as laser printers, inkjet printers, copiers, facsimile machines and the like, do not depart from the scope of the present invention. [0018] FIGS. 1 and 2 show perspective views of a prior art toner cartridge 100. The toner cartridge 100 includes, among other components, a toner hopper assembly 102 and a waste bin assembly 104. The waste bin assembly 104 includes a waste bin 106 and an organic photo conductor (OPC) drum 108. The OPC drum 108 comprises a cylindrical aluminum tube having first and second hubs 110 and 112, with each hub 110 and 112 extending from an end of the OPC drum 108. The second hub 112 includes a trilobe 111 extension which is used by the printer to rotate the OPC drum 108 during the printing process. The OPC drum 108 is held in place by a drive side end cap 114 and a non-drive side end cap 116 which include OPC retaining members 118 and 120, respectively. The OPC retaining members 118 and 120 each include cylindrical openings 119 and 121 respectively which engage and hold the ends of the hubs 110 and 112 during the rotation of the OPC drum 108. The cylindrical opening 121 of the OPC retaining member 120 is narrowed at the end by a flange 122. A clearer view of the this relationship is provided in FIG. 3 which shows a cross-sectional view of a portion of the waste bin assembly 104 including the OPC drum 108, the drive side end cap 114 and the non-drive side end cap 116. See also FIGS. 3A and 3B, which show perspective views of the waste bin assembly 104 after removal from the toner cartridge 100. The end caps 114 and 116 are secured to the waste bin 106 using, among other techniques, an adhesive, which inhibits the removal of either of the end caps 114 and 116 without causing undesirable damage to the end caps 114 and 116 and the waste bin 104. As described above, such damage may result in print defects when the toner cartridge 100 is reassembled. Thus, it is desirable to remove a currently installed OPC drum and replace it with a new OPC drum without disturbing the end caps 114 and 116. After the old OPC drum is removed, a replacement OPC drum must be installed. As described in U.S. patent application Ser. No. ______, filed on the same date as the present application, titled "Systems and Methods for Remanufacturing Imaging Components" and incorporated by reference herein in its entirety, a variety of suitable techniques may be used to install a replacement OPC drum with causing undesirable damage to the end caps 114 and 116. [0019] The present invention provides systems and methods removing an OPC drum in a toner cartridge having end caps that are fixedly secured to (and thus not readily removable from) the waste bin or other portion of the toner cartridge. Preferrably, prior to removing the existing OPC drum 108, the waste bin assembly 104 comprising the waste bin 106, end caps 114 and 116 and the OPC drum 108 is removed from the toner cartridge. The waste bin assembly 104 may be removed by extracting cartridge pins which hold the waste bin assembly 104 to the toner cartridge 100. To remove the OPC drum 108 without disturbing the end caps 114 and 116, one or more cuts should be made in the OPC drum 108 or hubs 110 and 112 to allow the OPC drum to be removed in pieces. [0020] In one aspect of the present invention, a cutter, such as a pipe cutter for example, may be used to make two cuts in the tube of the OPC drum 108. As seen in FIG. 4, the cuts may be made at locations 450 and 452, for example, to sever the drum into three portions. A center portion 108a of the OPC drum 108 may then be removed. Next, the two end portions 108b and 108c may be removed. In a preferred embodiment, the cuts should be performed without generating any debris which may impact printer performance. Other suitable cutting devices may be utilized also to perform the cutting operation. For example, a hacksaw may be used to make the cuts in the OPC drum 108. Continue reading... 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